CN218120207U - Heat exchange assembly for gas water heating equipment and gas water heating equipment - Google Patents

Abstract

The application relates to a heat exchange assembly for a gas-fired water heating apparatus and the gas-fired water heating apparatus. Gas hot-water heating equipment includes the equipment body and establishes smoke exhausting channel on the equipment body, heat exchange assembly includes: a heat exchanger having a first fluid passage in communication with the smoke evacuation passage and a second fluid passage for exchanging heat with the first fluid passage. The air is heated by the high-temperature flue gas, so that the air is heated for reuse, the heat energy of the high-temperature flue gas can be fully utilized, and the energy is saved.

Description

Heat exchange assembly for gas water heating equipment and gas water heating equipment

Technical Field

The application relates to the technical field of gas heating, in particular to a heat exchange assembly for gas water heating equipment and the gas water heating equipment.

Background

The gas water heating apparatus includes a gas heating furnace, a gas water heater, and the like, and heats water introduced into the gas water heating apparatus by burning gas, thereby providing a user with or heating the user. However, high-temperature flue gas can be generated in the combustion process of the gas water heating equipment, and after the flue gas is subjected to heat exchange by the main heat exchanger to heat water, the temperature of the flue gas discharged outdoors is still high, usually about 130 ℃, so that the waste of energy can be caused when the part of the flue gas discharged outdoors is directly discharged into the atmosphere.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a heat exchange assembly for a gas water heating device and the gas water heating device, aiming at the problem that energy is wasted due to direct emission of high-temperature flue gas.

According to an aspect of the present application, there is provided a heat exchange assembly for a gas water heater apparatus including an apparatus body and a smoke evacuation channel provided on the apparatus body, the heat exchange assembly including:

a heat exchanger having a first fluid passage in communication with the smoke evacuation passage and a second fluid passage for exchanging heat with the first fluid passage.

In one embodiment, the heat exchange assembly further comprises:

an air inlet pipe; and

and the air outlet pipe is communicated with the indoor environment, and the air inlet pipe and the air outlet pipe are respectively connected to two ends of the second fluid channel. The air outlet pipe can be used for discharging heated air to the indoor environment so as to supply heat to indoor users, and the heat exchange assembly is suitable for winter environments.

In one embodiment, the smoke evacuation channel has an upstream section connected to the apparatus body, and a downstream section opposite to the upstream section;

the first fluid passage is sealingly connected to the downstream section. The outflow of the first fluid from the smoke evacuation channel can be entirely passed through the first fluid channel to better heat the air entering the second fluid channel.

In one embodiment, the first fluid channel has a first fluid inlet and a first fluid outlet oppositely arranged along a first direction;

the second fluid channel is provided with a second fluid inlet and a second fluid outlet which are oppositely arranged along a second direction;

wherein central axes of the first fluid channel and the second fluid channel are coplanar, and the second direction and the first direction intersect with each other. The high-temperature flue gas and the air form crossed heat exchange in the heat exchanger, so that the air can be better heated, and the heat energy of the high-temperature flue gas can be more fully utilized.

In one embodiment, the number of the first fluid channel and the second fluid channel is multiple;

the first fluid channels and the second fluid channels are alternately stacked in a third direction;

the third direction intersects a plane in which central axes of the first fluid passage and the second fluid passage lie. The heat exchange area between the air in the heat exchanger and the high-temperature flue gas can be greatly increased, so that the air can exchange heat with the high-temperature flue gas more fully.

In one embodiment, the equipment body is provided with an air inlet channel which is arranged in parallel with the smoke exhaust channel and is independent of the smoke exhaust channel;

the apparatus body includes a combustion chamber;

the outlet end of the combustion chamber is communicated with the smoke exhaust channel;

the inlet end of the combustion chamber is communicated with the air inlet channel. The discharged high-temperature flue gas and the air entering the combustion chamber are not interfered with each other under the condition of saving space.

In one embodiment, an air inlet detection mechanism is disposed at an end of the air inlet pipe away from the heat exchanger, and the air inlet detection mechanism includes a three-way switching valve having a first air inlet end communicated with an outdoor environment, a second air inlet end communicated with an indoor environment, and an air outlet end communicated with the air inlet pipe. The first air inlet end can be selectively opened according to the air quality of the outdoor environment to realize the external circulation heating function or the second air inlet end can realize the internal circulation heating function.

In one embodiment, the air inlet detection mechanism further comprises an air detection mechanism, and the air detection mechanism is used for controlling the three-way switching valve to be switched to the air outlet end to be communicated with one of the first air inlet end and the second air inlet end according to air quality detection data of the air at the first air inlet end. The first air intake port may be selectively opened according to the air quality of the outdoor environment.

In one embodiment, the heat exchange assembly further comprises a timer and a controller;

the timer is used for starting timing when the three-way switching valve is switched to the state that the air outlet end is communicated with the second air inlet end;

the controller is used for controlling the three-way switching valve to be switched to the air outlet end to be communicated with the first air inlet end when the timing time of the timer exceeds first preset time.

According to another aspect of the application, a gas-fired water heating apparatus is provided, comprising the heat exchange assembly for the gas-fired water heating apparatus described above.

When the heat exchange assembly for the gas water heating equipment and the gas water heating equipment are used, high-temperature flue gas can enter the first fluid channel from the smoke exhaust channel, air enters the second fluid channel, and the high-temperature flue gas and the air exchange heat in the heat exchanger to enable the air to be heated and then to be recycled, so that the heat energy of the high-temperature flue gas can be fully utilized, and energy is saved.

Drawings

Fig. 1 shows a schematic structural diagram of a gas-fired water heating apparatus in an embodiment of the present application;

FIG. 2 illustrates a schematic diagram of a heat exchanger according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of an intake air detecting mechanism according to an embodiment of the present application;

FIG. 4 illustrates a bottom view of the inlet detection mechanism in an embodiment of the present application (when the second inlet port is in communication with the outlet port);

fig. 5 shows a bottom view of the intake air detecting mechanism in an embodiment of the present application (when the first intake end communicates with the exhaust end).

In the figure: 10. a gas fired water heating apparatus; 110. an apparatus body; 120. a smoke exhaust pipe; 121. a smoke evacuation channel; 122. an air intake passage; 123. an inner tube; 1231. a smoke vent; 124. an outer tube; 1241. an air inlet; 130. a combustion chamber; 140. an ignition mechanism; 150. a smoke exhaust machine; 210. a heat exchanger; 211. a first fluid channel; 212. a second fluid passage; 2131. a first fluid inlet; 2132. a first fluid outlet; 2141. a second fluid inlet; 2142. a second fluid outlet; 220. an air inlet pipe; 230. an air outlet pipe; 240. an air supply fan; 250. an intake air detection mechanism; 251. a three-way switching valve; 2511. a first air inlet end; 2512. a second air inlet end; 2513. an air outlet end; 2514. a valve seat; 2515. a valve core; 252. an air detection mechanism; 2521. a housing; 253. a motor; 2531. a motor bottom support; 254. an air quality detector; 260. an indoor air inlet box; 261. an air inlet.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Fig. 1 shows a schematic structural diagram of a gas-fired water heating apparatus in an embodiment of the present application.

Referring to fig. 1, a gas-fired water heating apparatus 10 provided in an embodiment of the present application includes an apparatus body 110 and a smoke evacuation channel 121 disposed on the apparatus body 110, the apparatus body 110 includes a combustion chamber 130, and an ignition mechanism 140 and a smoke evacuation machine 150 are disposed in the combustion chamber 130. The gas is burned at the ignition mechanism 140, and the generated high-temperature flue gas is exhausted from the combustion chamber 130 to the smoke exhaust channel 121 under the driving of the smoke exhaust fan 150.

The gas-fired water heating apparatus 10 also includes a heat exchange assembly for the gas-fired water heating apparatus 10.

Referring again to fig. 1, a heat exchange assembly provided in accordance with an embodiment of the present application includes a heat exchanger 210.

Referring again to fig. 1 in combination with fig. 2, the heat exchanger 210 has a first fluid passage 211 communicating with the smoke evacuation passageway 121, and a second fluid passage 212 for exchanging heat with the first fluid passage 211. The high-temperature flue gas can enter the first fluid channel 211 from the smoke exhaust channel 121, the air enters the second fluid channel 212, and the high-temperature flue gas and the air exchange heat in the heat exchanger 210, so that the air is heated and then is reused, thus, the heat energy of the high-temperature flue gas can be fully utilized, and the energy is saved.

Further, the heat exchange assembly further includes an inlet pipe 220 and an outlet pipe 230 communicating with the indoor environment, and the inlet pipe 220 and the outlet pipe 230 are connected to both ends of the second fluid passage 212, respectively. The high temperature flue gas can enter the first fluid channel 211 from the smoke exhaust channel 121, the air enters the second fluid channel 212 from the air inlet pipe 220, the high temperature flue gas and the air exchange heat in the heat exchanger 210 to heat the air, the heated air can be discharged to the indoor environment from the air outlet pipe 230 to heat indoor users, and the heat exchange assembly is suitable for winter environments.

Further, the air inlet pipe 220 and the air outlet pipe 230 are both located outside the apparatus body 110, so that the air outside the apparatus body 110 exchanges heat with the high temperature flue gas.

Further, referring to fig. 1 again, the heat exchange assembly further includes an air supply blower 240 disposed on the air outlet pipe 230, the air supply blower 240 is used for driving the air to flow from the air inlet pipe 220 toward the air outlet pipe 230, and the air is ensured to flow from the air inlet pipe 220 toward the air outlet pipe 230 under the driving of the air supply blower 240, so that the air flows directionally, and the heat exchange efficiency and effect are better.

Further, referring to fig. 1 and fig. 2 again, the smoke evacuation channel 121 has an upstream section connected to the apparatus body 110 and a downstream section opposite to the upstream section. The first fluid channel 211 is connected to the downstream section in a sealing manner, so that the first fluid flowing out of the smoke evacuation channel 121 passes through the first fluid channel 211. Specifically, the first fluid is high-temperature flue gas, and the high-temperature flue gas discharged from the smoke exhaust channel 121 can completely pass through the first fluid channel 211, and then exchanges heat with air entering the second fluid channel 212, so that the air is heated better.

Optionally, the downstream section is located outside the apparatus body 110, so that the heat exchanger 210 is also disposed outside the apparatus body 110, which facilitates maintenance of the heat exchanger 210.

Further, referring to fig. 2 again, the first fluid passage 211 has a first fluid inlet 2131 and a first fluid outlet 2132 oppositely disposed along the first direction, and the first fluid inlet 2131 is communicated with the smoke evacuation channel 121. The second fluid channel 212 has a second fluid inlet 2141 and a second fluid outlet 2142 oppositely arranged along the second direction. Wherein the central axes of the first fluid channel 211 and the second fluid channel 212 are coplanar, and the second direction and the first direction intersect with each other. The high-temperature flue gas flowing out of the smoke evacuation channel 121 sequentially passes through the first fluid inlet 2131 and the first fluid outlet 2132 of the first fluid channel 211, the air sequentially passes through the air inlet pipe 220, the second fluid inlet 2141 and the second fluid outlet 2142 of the second fluid channel 212, and the high-temperature flue gas and the air form crossed heat exchange in the heat exchanger 210, so that the air can be better heated, and the heat energy of the high-temperature flue gas can be more fully utilized.

In some embodiments, referring again to fig. 1, the first direction is parallel to the central axis of the smoke evacuation channel 121.

Further, referring to fig. 2 again, the number of the first fluid channels 211 and the second fluid channels 212 is multiple, and the first fluid channels 211 and the second fluid channels 212 are alternately stacked along the third direction. The third direction intersects the plane in which the central axes of the first fluid passage 211 and the second fluid passage 212 lie. The heat exchange area between the air in the heat exchanger 210 and the high-temperature flue gas can be greatly increased, so that the air can exchange heat with the high-temperature flue gas more fully to obtain higher-temperature air, the indoor heating requirement can be better ensured, and the energy can be saved.

In some embodiments, referring to fig. 1 again, the third direction, the first direction and the second direction are perpendicular to each other, that is, the central axes of the third direction, the first fluid channel 211 and the second fluid channel 212 are perpendicular to each other.

Further, referring to fig. 1 again, the apparatus body 110 is provided with an air inlet passage 122 which is parallel to the smoke exhaust passage 121 and is independent of the smoke exhaust passage 121; the outlet end of the combustion chamber 130 communicates with the smoke evacuation passageway 121; the inlet end of the combustion chamber 130 communicates with the intake passage 122. Air outside the device body 110 enters the combustion chamber 130 through the air inlet passage 122, so that the fuel gas is subjected to aerobic combustion at the ignition mechanism 140, and high-temperature flue gas generated by combustion is discharged from the smoke exhaust passage 121 under the driving of the smoke exhaust fan 150. The air intake passage 122 and the smoke exhaust passage 121 are independent of each other and do not interfere with each other, that is, the exhausted high temperature smoke and the air entering the combustion chamber 130 can be prevented from interfering with each other in a space-saving manner.

Further, the air intake passage 122 surrounds the smoke exhaust passage 121, and the air can exchange heat with the exhausted high temperature smoke before entering the combustion chamber 130, so as to improve the ignition efficiency of the ignition mechanism 140 of the combustion chamber 130.

In some embodiments, the smoke exhaust pipe 120 is disposed on the apparatus body 110, the smoke exhaust pipe 120 includes an outer pipe 124 and an inner pipe 123 disposed inside the outer pipe 124, wherein the smoke exhaust channel 121 is formed inside the inner pipe 123, the air intake channel 122 is formed between the outer pipe 124 and the inner pipe 123, the air intake channel 122 can surround the smoke exhaust channel 121, and the air intake channel 122 and the smoke exhaust channel 121 are independent of each other.

Further, the end of the inner pipe 123 away from the apparatus body 110 extends out of the end of the outer pipe 124 away from the apparatus body 110, so as to prevent the smoke exhausted from the smoke exhaust passage 121 from flowing into the air inlet passage 122 in the outer pipe 124.

Further, a smoke exhaust hole 1231 is arranged at one end of the inner pipe 123 far away from the device body 110; an air inlet 1241 is provided at an end of the outer tube 124 away from the device body 110, and the air inlet 1241 and the smoke exhaust hole 1231 are arranged in a staggered manner in the central axis direction of the smoke exhaust tube 120, so as to further ensure that air entering the air inlet passage 122 and smoke exiting the smoke exhaust passage 121 do not interfere with each other.

In some embodiments, the outer tube 124 has multiple sets of air inlet holes arranged axially, each set including multiple circumferentially arranged air inlet holes 1241, which may expand the air intake. The inner pipe 123 is axially provided with a plurality of groups of smoke evacuation holes, each group of smoke evacuation hole groups comprises a plurality of annularly arranged smoke evacuation holes 1231, and smoke can be evenly discharged from the tail end of the inner pipe 123 (the end of the inner pipe 123 far away from the equipment body 110).

Referring to fig. 1, with reference to fig. 3 and fig. 4, an inlet air detecting mechanism 250 is disposed at an end of the inlet air pipe 220 away from the heat exchanger 210, the inlet air detecting mechanism 250 includes a three-way switching valve 251, the three-way switching valve 251 has a first inlet 2511 communicated with the outdoor environment, a second inlet 2512 communicated with the indoor environment, and an outlet 2513 communicated with the inlet air pipe 220. The gas water heater 10 is usually installed indoors, the first air inlet 2511 can be selectively opened according to the air quality of the outdoor environment, if the air quality of the outdoor environment is poor, the first air inlet 2511 can be closed, and the second air inlet 2512 can be opened to enable the second air inlet 2512 to be communicated with the air outlet 2513, so that the indoor air enters the air inlet pipe 220 from the three-way switching valve 251 and further exchanges heat with high-temperature flue gas in the heat exchanger 210, and after the indoor air is heated, the indoor air is discharged indoors from the air outlet pipe 230 to heat the indoor space, and the function of internal circulation heating is achieved; meanwhile, the heat energy of the high-temperature flue gas can be fully utilized, and the energy is saved.

Referring to fig. 1 again, with reference to fig. 3 and fig. 5, if the air quality of the outdoor environment is better, such as the air quality of the outdoor environment after rain, the second air inlet 2512 can be closed, the first air inlet 2511 can be opened, and the first air inlet 2511 is communicated with the air outlet 2513, so that the outdoor air and the high-temperature flue gas can exchange heat in the heat exchanger 210, and the heated outdoor air enters the air inlet pipe 230 to heat the indoor space, thereby realizing the function of external circulation heating; the heat energy of the high-temperature flue gas can be fully utilized, and the energy is saved.

Further, referring to fig. 1 and fig. 3 again, the second air inlet 2512 is externally connected with an indoor air inlet box 260, the indoor air inlet box 260 can be mounted on an indoor wall, an air inlet 261 can be formed in a side of the indoor air inlet box 260 away from the wall, indoor air can enter the indoor air inlet box 260 from the air inlet 261 for temporary storage, and then in the process of realizing the internal circulation heating function, air in the indoor air inlet box 260 can continuously exchange heat with high-temperature flue gas to ensure indoor heating.

Further, referring to fig. 3 again, the air inlet detection mechanism 250 further includes an air detection mechanism 252 disposed on the three-way switching valve 251, and the air detection mechanism 252 is configured to control the three-way switching valve 251 to switch to the air outlet 2513 to communicate with one of the first air inlet 2511 and the second air inlet 2512 according to the air quality detection data of the air at the first air inlet 2511. The air detection mechanism 252 is disposed on the air inlet side of the heat exchanger 210, and can effectively reduce the possibility of blocking the heat exchanger 210 by dirty air, thereby improving the overall heat exchange effect of the heat exchanger 210 to a certain extent and improving the overall comfort of the user.

In some embodiments, referring again to fig. 3, air detection mechanism 252 includes a housing 2521, and a motor 253 and an air quality detector 254 disposed within housing 2521. The housing 2521 is connected to a valve seat 2514 of the three-way switching valve 251 so that the air detection mechanism 252 is mounted on the three-way switching valve 251. The air quality detector 254 is configured to obtain air quality detection data at the first air inlet 2511, and specifically, detect particulate matter such as PM2.5 and PM10 in the air. The three-way switching valve 251 is switched by driving the valve body 2515 of the three-way switching valve 251 by the motor 253, and the three-way switching valve 251 is switched to the air outlet end 2513 to be communicated with one of the first air inlet end 2511 and the second air inlet end 2512. If the air quality detection data at the first air inlet end 2511 is lower than the preset air quality value, the motor 253 drives the valve core 2515 of the three-way switching valve 251 to realize the switching of the three-way switching valve 251, please refer to fig. 5, so that the second air inlet end 2512 is closed, and the first air inlet end 2511 is communicated with the air outlet end 2513 to realize the external circulation heating function; if the air quality data in the first air inlet 2511 is higher than the preset air quality value, the motor 253 drives the valve core 2515 of the three-way switching valve 251 to realize the switching of the three-way switching valve 251, please refer to fig. 4, so that the first air inlet 2511 is closed, and the second air inlet 2512 is communicated with the air outlet 2513 to realize the internal circulation heating function.

Further, referring again to fig. 3, motor 253 is disposed within housing 2521 via a motor shoe 2531.

Further, the heat exchange assembly further comprises a timer and a controller; the timer is used for starting timing when the three-way switching valve 251 is switched to the air outlet end 2513 to be communicated with the second air inlet end 2512; the controller is used for controlling the three-way switching valve 251 to be switched to the air outlet end 2513 to be communicated with the first air inlet end 2511 when the timing time of the timer exceeds a first preset time. After the internal circulation heating function is used for a period of time, because the space of the indoor environment is limited, the temperature of the indoor air can rise after a period of time, at this time, the indoor air is not suitable for heat exchange with high-temperature smoke, so that the second air inlet end 2512 needs to be closed, the air outlet end 2513 is communicated with the first air inlet end 2511, heat exchange is carried out between the outdoor air and the high-temperature smoke instead, and the external circulation heating function is more suitable instead.

In some embodiments, the first preset time is 20-30 minutes, the gas water heater 10 is usually installed indoors, and the length of the first preset time is determined according to the volume of the indoor space, and the larger the volume is, the longer the first preset time is; the smaller the volume, the smaller the first preset time.

Generally speaking, the heat exchanger 210 disposed on the smoke exhaust channel 121 realizes the heat exchange between the "high temperature smoke" and the "outdoor (internal) air", so that the low temperature air is heat exchanged into high temperature air, and the heating of the user is realized under different environments. Meanwhile, the heat exchanger 210 has high universality and can be used for different types of products, such as a gas water heater or a gas heating furnace, and the heat exchanger 210 only needs to be installed on the smoke exhaust channels 121 of the different types of products, so that the high-temperature smoke can be recycled, and the maintenance is more convenient.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims (10)

1. A heat exchange assembly for a gas fired water heating apparatus, the gas fired water heating apparatus (10) comprising an apparatus body (110) and a smoke evacuation channel (121) provided on the apparatus body (110), the heat exchange assembly comprising:

a heat exchanger (210), the heat exchanger (210) having a first fluid passage (211) communicating with the smoke evacuation passage (121), and a second fluid passage (212) for exchanging heat with the first fluid passage (211).

2. The heat exchange assembly for a gas fired water heating apparatus according to claim 1, further comprising:

an intake pipe (220); and

and the air outlet pipe (230) is communicated with the indoor environment, and the air inlet pipe (220) and the air outlet pipe (230) are respectively connected to two ends of the second fluid channel (212).

3. Heat exchange assembly for gas-fired water heating plants according to claim 1, characterized in that said smoke evacuation channel (121) has an upstream section connected to said plant body (110), and a downstream section opposite said upstream section;

the first fluid channel (211) is sealingly connected to the downstream section.

4. The heat exchange assembly for a gas fired water heating apparatus according to claim 1, wherein the first fluid channel (211) has a first fluid inlet (2131) and a first fluid outlet (2132) oppositely disposed in a first direction;

the second fluid channel (212) is provided with a second fluid inlet (2141) and a second fluid outlet (2142) which are oppositely arranged along a second direction;

wherein central axes of the first fluid passage (211) and the second fluid passage (212) are coplanar, and the second direction and the first direction intersect with each other.

5. The heat exchange assembly for gas-fired hot water apparatuses as claimed in claim 4, wherein the number of the first fluid passage (211) and the second fluid passage (212) is plural;

the first fluid channels (211) and the second fluid channels (212) are alternately stacked in a third direction;

the third direction intersects a plane in which central axes of the first fluid passage (211) and the second fluid passage (212) lie.

6. Heat exchange assembly for gas-fired water heating appliances according to claim 1, characterized in that the appliance body (110) is provided with an air intake channel (122) arranged in parallel with the smoke evacuation channel (121) and independent of each other;

the apparatus body (110) comprises a combustion chamber (130);

the outlet end of the combustion chamber (130) is communicated with the smoke exhaust channel (121);

the inlet end of the combustion chamber (130) communicates with the intake passage (122).

7. The heat exchange assembly for a gas-fired water heating apparatus according to claim 2, wherein an end of the intake pipe (220) remote from the heat exchanger (210) is provided with an intake air detecting mechanism (250), the intake air detecting mechanism (250) includes a three-way switching valve (251), the three-way switching valve (251) has a first intake end (2511) communicating with an outdoor environment, a second intake end (2512) communicating with an indoor environment, and an outlet end (2513) communicating with the intake pipe (220).

8. The heat exchange assembly for a gas-fired water heating apparatus according to claim 7, wherein the air inlet detection mechanism (250) further comprises an air detection mechanism (252), and the air detection mechanism (252) is configured to control the three-way switching valve (251) to switch to the air outlet end (2513) to communicate with one of the first air inlet end (2511) and the second air inlet end (2512) according to air quality detection data of air at the first air inlet end (2511).

9. The heat exchange assembly for a gas fired water heating apparatus according to claim 8, further comprising a timer and a controller;

the timer is used for starting timing when the three-way switching valve (251) is switched to the communication between the air outlet end (2513) and the second air inlet end (2512);

the controller is used for controlling the three-way switching valve (251) to be switched to the air outlet end (2513) to be communicated with the first air inlet end (2511) when the timing time of the timer exceeds first preset time.

10. A gas-fired water heating apparatus, characterized by comprising a heat exchange assembly for a gas-fired water heating apparatus (10) according to any one of claims 1 to 9.

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